From: Richard Henderson <richard.henderson@linaro.org>
Date: Thu, 5 Aug 2021 01:09:15 +0000 (+0300)
Subject: tcg/sparc: Improve code gen for shifted 32-bit constants
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=684db2a0b04ff024d0a275de85982fe5892185d3;p=qemu.git

tcg/sparc: Improve code gen for shifted 32-bit constants

We had code for checking for 13 and 21-bit shifted constants,
but we can do better and allow 32-bit shifted constants.
This is still 2 insns shorter than the full 64-bit sequence.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/sparc/tcg-target.c.inc b/tcg/sparc/tcg-target.c.inc
index 7a8f20ee9a..ed2f4ecc40 100644
--- a/tcg/sparc/tcg-target.c.inc
+++ b/tcg/sparc/tcg-target.c.inc
@@ -462,17 +462,17 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         return;
     }
 
-    /* A 21-bit constant, shifted.  */
+    /* A 32-bit constant, shifted.  */
     lsb = ctz64(arg);
     test = (tcg_target_long)arg >> lsb;
-    if (check_fit_tl(test, 13)) {
-        tcg_out_movi_imm13(s, ret, test);
-        tcg_out_arithi(s, ret, ret, lsb, SHIFT_SLLX);
-        return;
-    } else if (lsb > 10 && test == extract64(test, 0, 21)) {
+    if (lsb > 10 && test == extract64(test, 0, 21)) {
         tcg_out_sethi(s, ret, test << 10);
         tcg_out_arithi(s, ret, ret, lsb - 10, SHIFT_SLLX);
         return;
+    } else if (test == (uint32_t)test || test == (int32_t)test) {
+        tcg_out_movi_int(s, TCG_TYPE_I64, ret, test, in_prologue, scratch);
+        tcg_out_arithi(s, ret, ret, lsb, SHIFT_SLLX);
+        return;
     }
 
     /* A 64-bit constant decomposed into 2 32-bit pieces.  */